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Doctors Medicines MCQs Q&A

(i) You have three unlabelled test-tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal.
(ii) Give the reason of formation of scum When soaps are used with hard water

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3 Answers

(i)

SOLUTION BLUE LITMUS PAPER RED LITMUS PAPER SODIUM METAL
Ethanol No change No change Hydrogen gas
Ethanoic acid Turns red No change Hydrogen gas
Soap No change Turns blue Hydrogen gas

(ii) Hard water contains calcium ions or magnesium ions or both. These ions on reacting with soap solution form insoluble substance called scum.

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Solution Blue Litmus paper Red Litmus Paper Sodium Metal
Ethanol No change No change Hydrogen gas
Ethanoic acid Turns red No change Hydrogen gas
Soap No change Tums blue Hydrogen gas

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Solution Blue Litmus paper Red Litmus Paper Sodium Metal
Ethanol No change No change Hydrogen gas
Ethanoic acid Turns red No change Hydrogen gas
Soap No change Tums blue Hydrogen gas

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